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Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Statement Of Income And Comprehensive Income [Abstract]        
Net income (loss) before dividends on redeemable convertible preferred stock $ 204 $ (2,003) $ 1,025 $ (2,745)
Other comprehensive income:        
Foreign currency translation gain (loss), net of deferred income taxes (315) (31) (410) (32)
Total comprehensive income (loss) $ (111) $ (2,034) $ 615 $ (2,777)